— Why do you want the book so much? — , sir.A. StudyingB. StudiedC. StudiesD. To study

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@@A. [email protected]@B. [email protected]@C. [email protected]@(答案)D. To study
解析： 本题的答语部分也是一个省略句。补全后这个句子应是:I want the book so much to study, sir.。本题选用动词不定式在句中作目的状语。